HTML Headings do not follow accessibility best practices
The heading structure on the office.com homepage does not follow a logical order, making it confusing for screen reader users. There are headings at level 1 and 3, but none at 2. The page skips from the greeting at heading level 1 to "Recommended" in the Documents region at heading level 3 (It would help with navigation if "Documents" itself was a heading). Similarly, the OneDrive and SharePoint regions begin with a heading 1 and skip to heading 3 for the immedieately following content.